Structures of New Saponins Isolated fromBupleurum kunmingenseY. LietS. L. Pan

From the roots of Bupleurum kunmingense, nine new saponins, named S26~S29, S31 ~S34 and S36, were isolated and their structures were determined based on chemical and NMR spectroscopic analysis as follows: S26, 3^,4^-di-O-acetylsaikosaponin-d; S27, 3",4"-di-O-acetylsaikosaponin-b4; S28, 3/',6//-di-0-acetylsaikosaponin-d; S29, 3//,4/'-di-0-acetylsaikosaponina; S31, 3//,6//-di-0-acetylsaikosaponin-a; S32, 2",3//-di-6>-acetylsaikosaponin-a; S33, 4//,6//-di-0acetylsaikosaponin-d; S34, 3 ^-0-acetylsaikosaponin-e; and S36, 2^,3 ^-di-O-acetylsaikosaponin-d.During the course of the investigation on saponins contained in the Bupleurum genus,1} we found that the saponin content of Bupleurum kunmingense Y. Li et S. L. Pan, which